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Finding the Fourth Proportional to 418.40, 626.70 and 225.80

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Solution

The fourth proportional to 418.40, 626.70 and 225.80 is: 338.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.40 : 626.70 = 225.80 : x
  2. Step 2: Convert to fraction form
    418.40/626.70 = 225.80/x
  3. Step 3: Cross multiply
    418.40x = 626.70 × 225.80
  4. Step 4: Simplify right side
    418.40x = 141,508.86
  5. Step 5: Solve for x
    x = 141,508.86/418.40
  6. Step 6: Final answer
    x = 338.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.